Enrique Hernandez Jr. stepped down from the board of directors of Wells Fargo in April following the costliest scandal in the U.S. bank's history, amid widespread criticism from corporate-governance experts and regulators. That legacy has trailed him as chairman of the board of McDonald's, the largest U.S. publicly-traded restaurant chain, which is set to hold its annual shareholder meeting this week.

Wall Street is on pins and needles waiting for Amazon to announce its plans to get into the healthcare space. If Amazon opts to get into the pharmacy space, the financial impact to Walgreens and Rite Aid could be devastating.